POLARIZATION DIVISION INTERFEROMETRY
Creators:Polavarapu, P. L.
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Publisher:Ohio State University
Current Fourier transform infrared (FTIR) spectrometers are built around an amplitude division inteferometer (ADI), commonly referred to as Michelson interferometer. In an ADI the input light is divided into two equal amplitude components by a beamsplitter and they are brought back to the beamsplitter for interference. An interferometer based on polarization division of the incoming light, developed by Martin and Puplett in 1969 for the far-infrared region, has escaped the attention of spectroscopists until recently. Such an interferometer for the mid-infrared region, referred to here as polarization division interferometer (PDI), offers certain advantages over the conventional ADI based FTIR spectrometers. In particular, for measuring polarization dependent molecular properties such as linear dichroism, circular dichroism, differential reflection-absorption on surfaces and differential polarized scattering (or emission), PDI is expected to provide at least two times more efficiency than ADI. PDI also eliminates the need for expensive polarization modulation accessories needed with an ADI for accomplishing these measurements. PDI also permits relatively convenient measurements on birefringence and on micro- to nanosecond time resolved behaviour of the above mentioned properties. In this talk, I will summarize the progress made in our laboratory [Applied Spectroscopy, 48, 1224, 1403, 1410 and 1562 (1994)] in developing a PDI for the mid- and far-infrared regions and in realizing most of the above mentioned experiments.
Author Institution: Vanderbilt University, Nashville, TN 37235
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